1, preparation materials: corn oil 2 1 g, clear water 20g, 1 fine sugar 8g, egg yolk 2g, low-gluten flour 40g, egg white 2g and fine sugar 2g;

2. Put water, oil and 1 fine sugar in a basin for quick mixing and emulsification. After emulsification, it is milky white. Sieve and add low-gluten flour to mix. After adding egg yolk, mix evenly by Z-shaped or one-word method.

3. After the egg white bubbles, add 2 fine granulated sugar in three times until it is hard to foam. Take out one third of the egg white paste and mix it evenly. Pour the mixed batter into the egg white paste and stir it evenly.

4. Pour into the mold, bake in the preheated150 oven for 50 minutes, take out the inverted button and let it cool, and then demould.